Operation manual
6
U-5~48MX3 + U-8~48ME3XPQ
Urban Multi air conditioner
4PW16236-1
Symptom 6: White mist comes out of a unit
Symptom 6.1: Indoor unit
■
When humidity is high during cooling operation
If the interior of an indoor unit is extremely contaminated, the
temperature distribution inside a room becomes uneven. It is
necessary to clean the interior of the indoor unit. Ask your dealer
for details on cleaning the unit. This operation requires a
qualified service person.
■
Immediately after the cooling operation stops and if the room
temperature and humidity are low
This is because warm refrigerant gas flows back into the indoor
unit and generates steam.
Symptom 6.2: Indoor unit, outdoor unit
■
When the system is changed over to heating operation after
defrost operation
Moisture generated by defrost becomes steam and is
exhausted.
Symptom 7: Noise of air conditioners
Symptom 7.1: Indoor unit
■
A "zeen" sound is heard immediately after the power supply is
turned on.
The electronic expansion valve inside an indoor unit starts
working and makes the noise. Its volume will reduce in about
one minute.
■
A continuous low "shah" sound is heard when the system is in
cooling operation or at a stop
When the drain pump (optional accessories) is in operation, this
noise is heard.
■
A "pishi-pishi" squeaking sound is heard when the system stops
after heating operation.
Expansion and contraction of plastic parts caused by
temperature change make this noise.
■
A low "sah", "choro-choro" sound is heard while the indoor unit
is stopped.
When the other indoor unit is in operation, this noise is heard. In
order to prevent oil and refrigerant from remaining in the system,
a small amount of refrigerant is kept flowing.
Symptom 7.2: Indoor unit, outdoor unit
■
A continuous low hissing sound is heard when the system is in
cooling or defrost operation.
This is the sound of refrigerant gas flowing through both indoor
and outdoor units.
■
A hissing sound which is heard at the start or immediately after
stopping operation or defrost operation.
This is the noise of refrigerant caused by flow stop or flow
change.
Symptom 8: Dust comes out of the unit
■
When the unit is used for the first time in a long time.
This is because dust has gotten into the unit.
Symptom 8.1: Outdoor unit
■
When the tone of operating noise changes.
This noise is caused by the change of frequency.
Symptom 9: The units can give off odours
■
The unit can absorb the smell of rooms, furniture, cigarettes,
etc., and then emit it again.
Symptom 10: The outdoor unit fan does not spin.
■
During operation.
The speed of the fan is controlled in order to optimize product
operation.
Symptom 11: The display shows “
”
.
■
This is the case immediately after the main power supply switch
is turned on and means that the remote controller is in normal
condition. This continues for one minute.
Symptom 12: The compressor in the outdoor unit does not stop after a
short heating operation
■
This is to prevent oil and refrigerant from remaining in the
compressor. The unit will stop after 5 to 10 minutes.
Symptom 13: The inside of an outdoor unit is warm even when the unit
has stopped
■
This is because the crankcase heater is warming the
compressor so that the compressor can start smoothly.
9.
T
ROUBLESHOOTING
If one of the following malfunctions occur, take the measures shown
below and contact your dealer.
The system must be repaired by a qualified service person.
■
If a safety device such as a fuse, a breaker or an earth leakage
breaker frequently actuates, or the ON/OFF switch does not
properly work;
Measure: Turn off the main power switch.
■
If water leaks from unit;
Measure: Stop the operation.
■
If the display
, the unit number and the operation lamp
flash and the malfunction code appears; (See figure 9)
Measure: Notify your dealer and report the malfunction code.
If the system does not properly operate except for the above
mentioned cases and none of the above mentioned malfunctions is
evident, investigate the system according to the following
procedures.
1
If the system does not operate at all;
■
Check if there is no power failure.
Wait until power is restored. If power failure occurs during
operation, the system automatically restarts immediately after
the power supply is recovered.
■
Check if no fuse has blown or breaker has worked. Change the
fuse or reset the breaker if necessary.
2
If the system goes into fan only operation, but as soon as it goes
into heating or cooling operation, the system stops;
■
Check if air inlet or outlet of outdoor or indoor unit is not blocked
by obstacles. Remove any obstacle and make it well-ventilated.
■
Check if the remote controller display shows “
” (time to
clean the air filter). (Refer to "Maintenance" in the indoor unit
manual.)
1
Inspection display
2
Indoor unit number in which a malfunction occurs
3
Operation lamp
4
Malfunction code
TEST
